plasma-framework/private/windowpreview.cpp

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/*
* Copyright 2007 by Dan Meltzer <hydrogen@notyetimplemented.com>
* Copyright (C) 2008 by Alexis Ménard <darktears31@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Library General Public License as
* published by the Free Software Foundation; either version 2, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details
*
* You should have received a copy of the GNU Library General Public
* License along with this program; if not, write to the
* Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include "windowpreview_p.h"
#include <kwindowsystem.h>
#ifdef Q_WS_X11
#include <QX11Info>
#include <X11/Xlib.h>
#include <fixx11h.h>
#endif
namespace Plasma {
bool WindowPreview::previewsAvailable() // static
{
if (!KWindowSystem::compositingActive()) {
return false;
}
#ifdef Q_WS_X11
// hackish way to find out if KWin has the effect enabled,
// TODO provide proper support
Display *dpy = QX11Info::display();
Atom atom = XInternAtom(dpy, "_KDE_WINDOW_PREVIEW", False);
int cnt;
Atom *list = XListProperties(dpy, DefaultRootWindow(dpy), &cnt);
if (list != NULL) {
bool ret = (qFind(list, list + cnt, atom) != list + cnt);
XFree(list);
return ret;
}
#endif
return false;
}
WindowPreview::WindowPreview(QWidget *parent)
: QWidget(parent)
{
}
void WindowPreview::setWindowId(WId w)
{
if (!previewsAvailable()) {
id = 0;
return;
}
id = w;
readWindowSize();
}
WId WindowPreview::windowId() const
{
return id;
}
QSize WindowPreview::sizeHint() const
{
if (id == 0) {
return QSize();
}
if (!windowSize.isValid()) {
readWindowSize();
}
QSize s = windowSize;
s.scale(200, 150, Qt::KeepAspectRatio);
return s;
}
void WindowPreview::readWindowSize() const
{
#ifdef Q_WS_X11
Window r;
int x, y;
unsigned int w, h, b, d;
if (id > 0 && XGetGeometry(QX11Info::display(), id, &r, &x, &y, &w, &h, &b, &d)) {
windowSize = QSize(w, h);
} else {
windowSize = QSize();
}
#else
windowSize = QSize();
#endif
}
void WindowPreview::setInfo()
{
#ifdef Q_WS_X11
Display *dpy = QX11Info::display();
Atom atom = XInternAtom(dpy, "_KDE_WINDOW_PREVIEW", False);
if (id == 0) {
XDeleteProperty(dpy, parentWidget()->winId(), atom);
return;
}
if (!windowSize.isValid()) {
readWindowSize();
}
if (!windowSize.isValid()) {
XDeleteProperty(dpy, parentWidget()->winId(), atom);
return;
}
Q_ASSERT(parentWidget()->isWindow()); // parent must be toplevel
long data[] = { 1, 5, id, x(), y(), width(), height() };
XChangeProperty(dpy, parentWidget()->winId(), atom, atom, 32, PropModeReplace,
reinterpret_cast<unsigned char *>(data), sizeof(data) / sizeof(data[ 0 ]));
#endif
}
} // namespace Plasma
#include "windowpreview_p.moc"